class A:
    def __init__(self, a, b):
        self._foo = a
        self._bar = b
    def get_foo(self):
        return self._foo
    def get_bar(self):
        return self._bar

def do_that(given):
    x = given.get_foo()
    x += 10

    y = given._bar
    y[0] += ' there'
    y = ['cool']

    given = A(-10, ['bye'])

x = A(1, ['boo'])
print(x.get_foo())
print(x.get_bar())
do_that(x)
print(x.get_foo())
print(x.get_bar())